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Manhattan PL-2303 USB to Serial Converter (205146)
USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter - Sabrent
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Amazon.co.jp: UGREEN RS232 USB 9 Pin Converter Serial Cable D-sub9 Pin Compatible with Windows Mac OS 3.3 ft (1 m) : Computers
4 Port USB to RS232 Serial Adapter Hub - シリアルカード & アダプタ | StarTech.com 日本
USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | StarTech.com Belgium
4 Port Professional RS-232 USB 2.0 to Serial Adapter
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Amazon.co.jp: UGREEN RS232 USB 9 Pin Converter Serial Cable D-sub9 Pin Compatible with Windows Mac OS 3.3 ft (1 m) : Computers
USB 2.0 to 16-Port RS-232, RS-422, RS-485 DB9M Serial Interface Adapter - Sealevel